package com.example.router;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.FIELD) //作用在属性上
@Retention(RetentionPolicy.CLASS) //编译时
public @interface Extra {
    String name() default "";
}
